add show soft keyboard at activity start functionality

app/src/main/java/chat/rocket/android/chatroom/ui/ChatRoomFragment.kt

@@ -115,6 +115,7 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardPopup.Listener {
     }
 
     override fun onDestroyView() {
+        presenter.saveUnfinishedMessage(chatRoomId, text_message.text.toString())
         presenter.unsubscribeMessages(chatRoomId)
         handler.removeCallbacksAndMessages(null)
         unsubscribeTextMessage()
@@ -350,6 +351,7 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardPopup.Listener {
             button_show_attachment_options.alpha = 1f
             button_show_attachment_options.setVisible(true)
 
+            getUnfinishedMessage()
             subscribeTextMessage()
             emojiKeyboardPopup = EmojiKeyboardPopup(activity!!, activity!!.findViewById(R.id.fragment_container))
             emojiKeyboardPopup.listener = this
@@ -410,6 +412,14 @@ class ChatRoomFragment : Fragment(), ChatRoomView, EmojiKeyboardPopup.Listener {
         }
     }
 
+    private fun getUnfinishedMessage() {
+        val unfinishedMessage = presenter.getUnfinishedMessage(chatRoomId)
+        if (unfinishedMessage.isNotBlank() && activity != null) {
+            text_message.setText(unfinishedMessage)
+            KeyboardHelper.showSoftKeyboardOnActivityStart(activity!!, text_message)
+        }
+    }
+
     private fun openEmojiKeyboardPopup() {
         if (!emojiKeyboardPopup.isShowing()) {
             // If keyboard is visible, simply show the  popup

app/src/main/java/chat/rocket/android/helper/KeyboardHelper.kt

@@ -4,6 +4,7 @@ import android.app.Activity
 import android.content.Context
 import android.graphics.Rect
 import android.view.View
+import android.view.WindowManager
 import android.view.inputmethod.InputMethodManager
 
 
@@ -50,4 +51,15 @@ object KeyboardHelper {
             inputMethodManager.toggleSoftInput(InputMethodManager.SHOW_IMPLICIT, InputMethodManager.SHOW_IMPLICIT)
         }
     }
+
+    /**
+     *  Show the soft keyboard for the given view at the start of activity or fragment.
+     *
+     *  @param view View to receive input focus.
+     */
+    fun showSoftKeyboardOnActivityStart(activity: Activity, view: View) {
+        if (view.requestFocus()) {
+            activity.window.setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE)
+        }
+    }
 }
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